Hi, I know that power is transfered from the primary to the secondary by the alternating magnetic flux generated by the primary. The alternating magnetic flux induces a voltage which if the secondary is closed will cause a current to flow. What I want to know is how exactly is the power transferred? I know that when current flows through the secondary, the secondary reduces the flux in the core and this then causes the primary to pull more current because of the reduced back-emf on its self. Less flux means with the same rate of change, you have less back-emf opposing the primary's current and thus the primary increases it's current pull to compensate. I believe if I am correct that this is the how power is transfered but I am not 100% sure. Is this correct? If not then how is the power transferred.